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Calculate Tips in 3 Countries With One Free Tool (2026)

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Tipping math is one of those problems that looks trivial until you're the one holding the bill. Three countries, three different norms, a pre-tax vs. post-tax trap, and four friends all reaching for their phones to "figure out their share." I kept a notes-app formula for this for years. Then I built a proper tool. Here's the whole thing: the rules, the demo, and why it lives in the browser.

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